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vpp/extras/deprecated/vnet/vxlan-gbp/decap.c
Neale Ranns 3be9164f80 misc: deprecate gbp and its dependents 
Type: improvement

Signed-off-by: Neale Ranns <nranns@cisco.com>
Signed-off-by: Benoît Ganne <bganne@cisco.com>
Change-Id: I2f30a4f04fd9a8635ce2d259b5fd5b0c85cee8c3
2021-11-23 13:03:36 +00:00

1051 lines
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/*
* decap.c: vxlan gbp tunnel decap packet processing
*
* Copyright (c) 2018 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vlib/vlib.h>
#include <vnet/vxlan-gbp/vxlan_gbp.h>
typedef struct
{
u32 next_index;
u32 tunnel_index;
u32 error;
u32 vni;
u16 sclass;
u8 flags;
} vxlan_gbp_rx_trace_t;
static u8 *
format_vxlan_gbp_rx_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
vxlan_gbp_rx_trace_t *t = va_arg (*args, vxlan_gbp_rx_trace_t *);
if (t->tunnel_index == ~0)
return format (s,
"VXLAN_GBP decap error - tunnel for vni %d does not exist",
t->vni);
return format (s,
"VXLAN_GBP decap from vxlan_gbp_tunnel%d vni %d sclass %d"
" flags %U next %d error %d",
t->tunnel_index, t->vni, t->sclass,
format_vxlan_gbp_header_gpflags, t->flags,
t->next_index, t->error);
}
always_inline u32
buf_fib_index (vlib_buffer_t * b, u32 is_ip4)
{
u32 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
if (sw_if_index != (u32) ~ 0)
return sw_if_index;
u32 *fib_index_by_sw_if_index = is_ip4 ?
ip4_main.fib_index_by_sw_if_index : ip6_main.fib_index_by_sw_if_index;
sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
return vec_elt (fib_index_by_sw_if_index, sw_if_index);
}
typedef vxlan4_gbp_tunnel_key_t last_tunnel_cache4;
always_inline vxlan_gbp_tunnel_t *
vxlan4_gbp_find_tunnel (vxlan_gbp_main_t * vxm, last_tunnel_cache4 * cache,
u32 fib_index, ip4_header_t * ip4_0,
vxlan_gbp_header_t * vxlan_gbp0)
{
/*
* Check unicast first since that's where most of the traffic comes from
* Make sure VXLAN_GBP tunnel exist according to packet SIP, DIP and VNI
*/
vxlan4_gbp_tunnel_key_t key4;
int rv;
key4.key[1] = (((u64) fib_index << 32) |
(vxlan_gbp0->vni_reserved &
clib_host_to_net_u32 (0xffffff00)));
key4.key[0] =
(((u64) ip4_0->dst_address.as_u32 << 32) | ip4_0->src_address.as_u32);
if (PREDICT_FALSE (key4.key[0] != cache->key[0] ||
key4.key[1] != cache->key[1]))
{
rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_gbp_tunnel_by_key,
&key4);
if (PREDICT_FALSE (rv == 0))
{
*cache = key4;
return (pool_elt_at_index (vxm->tunnels, cache->value));
}
}
else
{
return (pool_elt_at_index (vxm->tunnels, cache->value));
}
/* No unicast match - try multicast */
if (PREDICT_TRUE (!ip4_address_is_multicast (&ip4_0->dst_address)))
return (NULL);
key4.key[0] = ip4_0->dst_address.as_u32;
/* Make sure mcast VXLAN_GBP tunnel exist by packet DIP and VNI */
rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_gbp_tunnel_by_key, &key4);
if (PREDICT_FALSE (rv != 0))
return (NULL);
return (pool_elt_at_index (vxm->tunnels, key4.value));
}
typedef vxlan6_gbp_tunnel_key_t last_tunnel_cache6;
always_inline vxlan_gbp_tunnel_t *
vxlan6_gbp_find_tunnel (vxlan_gbp_main_t * vxm, last_tunnel_cache6 * cache,
u32 fib_index, ip6_header_t * ip6_0,
vxlan_gbp_header_t * vxlan_gbp0)
{
/* Make sure VXLAN_GBP tunnel exist according to packet SIP and VNI */
vxlan6_gbp_tunnel_key_t key6 = {
.key = {
[0] = ip6_0->src_address.as_u64[0],
[1] = ip6_0->src_address.as_u64[1],
[2] = ((((u64) fib_index) << 32) |
(vxlan_gbp0->vni_reserved &
clib_host_to_net_u32 (0xffffff00))),
}
};
int rv;
if (PREDICT_FALSE
(clib_bihash_key_compare_24_8 (key6.key, cache->key) == 0))
{
rv = clib_bihash_search_inline_24_8 (&vxm->vxlan6_gbp_tunnel_by_key,
&key6);
if (PREDICT_FALSE (rv != 0))
return NULL;
*cache = key6;
}
vxlan_gbp_tunnel_t *t0 = pool_elt_at_index (vxm->tunnels, cache->value);
/* Validate VXLAN_GBP tunnel SIP against packet DIP */
if (PREDICT_FALSE
(!ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6)))
{
/* try multicast */
if (PREDICT_TRUE (!ip6_address_is_multicast (&ip6_0->dst_address)))
return 0;
/* Make sure mcast VXLAN_GBP tunnel exist by packet DIP and VNI */
key6.key[0] = ip6_0->dst_address.as_u64[0];
key6.key[1] = ip6_0->dst_address.as_u64[1];
rv = clib_bihash_search_inline_24_8 (&vxm->vxlan6_gbp_tunnel_by_key,
&key6);
if (PREDICT_FALSE (rv != 0))
return 0;
}
return t0;
}
always_inline vxlan_gbp_input_next_t
vxlan_gbp_tunnel_get_next (const vxlan_gbp_tunnel_t * t, vlib_buffer_t * b0)
{
if (VXLAN_GBP_TUNNEL_MODE_L2 == t->mode)
return (VXLAN_GBP_INPUT_NEXT_L2_INPUT);
else
{
ethernet_header_t *e0;
u16 type0;
e0 = vlib_buffer_get_current (b0);
vlib_buffer_advance (b0, sizeof (*e0));
type0 = clib_net_to_host_u16 (e0->type);
switch (type0)
{
case ETHERNET_TYPE_IP4:
return (VXLAN_GBP_INPUT_NEXT_IP4_INPUT);
case ETHERNET_TYPE_IP6:
return (VXLAN_GBP_INPUT_NEXT_IP6_INPUT);
}
}
return (VXLAN_GBP_INPUT_NEXT_DROP);
}
always_inline uword
vxlan_gbp_input (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame, u8 is_ip4)
{
vxlan_gbp_main_t *vxm = &vxlan_gbp_main;
vnet_main_t *vnm = vxm->vnet_main;
vnet_interface_main_t *im = &vnm->interface_main;
vlib_combined_counter_main_t *rx_counter =
im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
vlib_combined_counter_main_t *drop_counter =
im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;
last_tunnel_cache4 last4;
last_tunnel_cache6 last6;
u32 pkts_decapsulated = 0;
u32 thread_index = vlib_get_thread_index ();
if (is_ip4)
clib_memset (&last4, 0xff, sizeof last4);
else
clib_memset (&last6, 0xff, sizeof last6);
u32 next_index = node->cached_next_index;
u32 *from = vlib_frame_vector_args (from_frame);
u32 n_left_from = from_frame->n_vectors;
while (n_left_from > 0)
{
u32 *to_next, n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
/* Prefetch next iteration. */
{
vlib_buffer_t *p2, *p3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
vlib_prefetch_buffer_header (p2, LOAD);
vlib_prefetch_buffer_header (p3, LOAD);
CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
}
u32 bi0 = to_next[0] = from[0];
u32 bi1 = to_next[1] = from[1];
from += 2;
to_next += 2;
n_left_to_next -= 2;
n_left_from -= 2;
vlib_buffer_t *b0, *b1;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
/* udp leaves current_data pointing at the vxlan_gbp header */
void *cur0 = vlib_buffer_get_current (b0);
void *cur1 = vlib_buffer_get_current (b1);
vxlan_gbp_header_t *vxlan_gbp0 = cur0;
vxlan_gbp_header_t *vxlan_gbp1 = cur1;
ip4_header_t *ip4_0, *ip4_1;
ip6_header_t *ip6_0, *ip6_1;
if (is_ip4)
{
ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t);
ip4_1 = cur1 - sizeof (udp_header_t) - sizeof (ip4_header_t);
}
else
{
ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t);
ip6_1 = cur1 - sizeof (udp_header_t) - sizeof (ip6_header_t);
}
u32 fi0 = buf_fib_index (b0, is_ip4);
u32 fi1 = buf_fib_index (b1, is_ip4);
vxlan_gbp_tunnel_t *t0, *t1;
if (is_ip4)
{
t0 =
vxlan4_gbp_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan_gbp0);
t1 =
vxlan4_gbp_find_tunnel (vxm, &last4, fi1, ip4_1, vxlan_gbp1);
}
else
{
t0 =
vxlan6_gbp_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan_gbp0);
t1 =
vxlan6_gbp_find_tunnel (vxm, &last6, fi1, ip6_1, vxlan_gbp1);
}
u32 len0 = vlib_buffer_length_in_chain (vm, b0);
u32 len1 = vlib_buffer_length_in_chain (vm, b1);
vxlan_gbp_input_next_t next0, next1;
u8 error0 = 0, error1 = 0;
u8 flags0 = vxlan_gbp_get_flags (vxlan_gbp0);
u8 flags1 = vxlan_gbp_get_flags (vxlan_gbp1);
/* Required to make the l2 tag push / pop code work on l2 subifs */
/* pop vxlan_gbp */
vlib_buffer_advance (b0, sizeof *vxlan_gbp0);
vlib_buffer_advance (b1, sizeof *vxlan_gbp1);
u8 i_and_g0 = ((flags0 & VXLAN_GBP_FLAGS_GI) == VXLAN_GBP_FLAGS_GI);
u8 i_and_g1 = ((flags1 & VXLAN_GBP_FLAGS_GI) == VXLAN_GBP_FLAGS_GI);
/* Validate VXLAN_GBP tunnel encap-fib index against packet */
if (PREDICT_FALSE (t0 == NULL || !i_and_g0))
{
if (t0 != NULL && !i_and_g0)
{
error0 = VXLAN_GBP_ERROR_BAD_FLAGS;
vlib_increment_combined_counter
(drop_counter, thread_index, t0->sw_if_index, 1, len0);
next0 = VXLAN_GBP_INPUT_NEXT_DROP;
}
else
{
error0 = VXLAN_GBP_ERROR_NO_SUCH_TUNNEL;
next0 = VXLAN_GBP_INPUT_NEXT_PUNT;
if (is_ip4)
b0->punt_reason =
vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP4];
else
b0->punt_reason =
vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP6];
}
b0->error = node->errors[error0];
}
else
{
next0 = vxlan_gbp_tunnel_get_next (t0, b0);
/* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
vlib_increment_combined_counter
(rx_counter, thread_index, t0->sw_if_index, 1, len0);
pkts_decapsulated++;
}
vnet_buffer2 (b0)->gbp.flags = (vxlan_gbp_get_gpflags (vxlan_gbp0) |
VXLAN_GBP_GPFLAGS_R);
vnet_buffer2 (b0)->gbp.sclass = vxlan_gbp_get_sclass (vxlan_gbp0);
if (PREDICT_FALSE (t1 == NULL || !i_and_g1))
{
if (t1 != NULL && !i_and_g1)
{
error1 = VXLAN_GBP_ERROR_BAD_FLAGS;
vlib_increment_combined_counter
(drop_counter, thread_index, t1->sw_if_index, 1, len1);
next1 = VXLAN_GBP_INPUT_NEXT_DROP;
}
else
{
error1 = VXLAN_GBP_ERROR_NO_SUCH_TUNNEL;
next1 = VXLAN_GBP_INPUT_NEXT_PUNT;
if (is_ip4)
b1->punt_reason =
vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP4];
else
b1->punt_reason =
vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP6];
}
b1->error = node->errors[error1];
}
else
{
next1 = vxlan_gbp_tunnel_get_next (t1, b1);
/* Set packet input sw_if_index to unicast VXLAN_GBP tunnel for learning */
vnet_buffer (b1)->sw_if_index[VLIB_RX] = t1->sw_if_index;
pkts_decapsulated++;
vlib_increment_combined_counter
(rx_counter, thread_index, t1->sw_if_index, 1, len1);
}
vnet_buffer2 (b1)->gbp.flags = (vxlan_gbp_get_gpflags (vxlan_gbp1) |
VXLAN_GBP_GPFLAGS_R);
vnet_buffer2 (b1)->gbp.sclass = vxlan_gbp_get_sclass (vxlan_gbp1);
vnet_update_l2_len (b0);
vnet_update_l2_len (b1);
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_gbp_rx_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->next_index = next0;
tr->error = error0;
tr->tunnel_index = t0 == 0 ? ~0 : t0 - vxm->tunnels;
tr->vni = vxlan_gbp_get_vni (vxlan_gbp0);
tr->sclass = vxlan_gbp_get_sclass (vxlan_gbp0);
tr->flags = vxlan_gbp_get_gpflags (vxlan_gbp0);
}
if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_gbp_rx_trace_t *tr =
vlib_add_trace (vm, node, b1, sizeof (*tr));
tr->next_index = next1;
tr->error = error1;
tr->tunnel_index = t1 == 0 ? ~0 : t1 - vxm->tunnels;
tr->vni = vxlan_gbp_get_vni (vxlan_gbp1);
tr->sclass = vxlan_gbp_get_sclass (vxlan_gbp1);
tr->flags = vxlan_gbp_get_gpflags (vxlan_gbp1);
}
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0 = to_next[0] = from[0];
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
/* udp leaves current_data pointing at the vxlan_gbp header */
void *cur0 = vlib_buffer_get_current (b0);
vxlan_gbp_header_t *vxlan_gbp0 = cur0;
ip4_header_t *ip4_0;
ip6_header_t *ip6_0;
if (is_ip4)
ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t);
else
ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t);
u32 fi0 = buf_fib_index (b0, is_ip4);
vxlan_gbp_tunnel_t *t0;
if (is_ip4)
t0 = vxlan4_gbp_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan_gbp0);
else
t0 = vxlan6_gbp_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan_gbp0);
uword len0 = vlib_buffer_length_in_chain (vm, b0);
vxlan_gbp_input_next_t next0;
u8 error0 = 0;
u8 flags0 = vxlan_gbp_get_flags (vxlan_gbp0);
/* pop (ip, udp, vxlan_gbp) */
vlib_buffer_advance (b0, sizeof (*vxlan_gbp0));
u8 i_and_g0 = ((flags0 & VXLAN_GBP_FLAGS_GI) == VXLAN_GBP_FLAGS_GI);
/* Validate VXLAN_GBP tunnel encap-fib index against packet */
if (PREDICT_FALSE (t0 == NULL || !i_and_g0))
{
if (t0 != NULL && !i_and_g0)
{
error0 = VXLAN_GBP_ERROR_BAD_FLAGS;
vlib_increment_combined_counter
(drop_counter, thread_index, t0->sw_if_index, 1, len0);
next0 = VXLAN_GBP_INPUT_NEXT_DROP;
}
else
{
error0 = VXLAN_GBP_ERROR_NO_SUCH_TUNNEL;
next0 = VXLAN_GBP_INPUT_NEXT_PUNT;
if (is_ip4)
b0->punt_reason =
vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP4];
else
b0->punt_reason =
vxm->punt_no_such_tunnel[FIB_PROTOCOL_IP6];
}
b0->error = node->errors[error0];
}
else
{
next0 = vxlan_gbp_tunnel_get_next (t0, b0);
/* Set packet input sw_if_index to unicast VXLAN_GBP tunnel for learning */
vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
pkts_decapsulated++;
vlib_increment_combined_counter
(rx_counter, thread_index, t0->sw_if_index, 1, len0);
}
vnet_buffer2 (b0)->gbp.flags = (vxlan_gbp_get_gpflags (vxlan_gbp0) |
VXLAN_GBP_GPFLAGS_R);
vnet_buffer2 (b0)->gbp.sclass = vxlan_gbp_get_sclass (vxlan_gbp0);
/* Required to make the l2 tag push / pop code work on l2 subifs */
vnet_update_l2_len (b0);
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_gbp_rx_trace_t *tr
= vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->next_index = next0;
tr->error = error0;
tr->tunnel_index = t0 == 0 ? ~0 : t0 - vxm->tunnels;
tr->vni = vxlan_gbp_get_vni (vxlan_gbp0);
tr->sclass = vxlan_gbp_get_sclass (vxlan_gbp0);
tr->flags = vxlan_gbp_get_gpflags (vxlan_gbp0);
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Do we still need this now that tunnel tx stats is kept? */
u32 node_idx =
is_ip4 ? vxlan4_gbp_input_node.index : vxlan6_gbp_input_node.index;
vlib_node_increment_counter (vm, node_idx, VXLAN_GBP_ERROR_DECAPSULATED,
pkts_decapsulated);
return from_frame->n_vectors;
}
VLIB_NODE_FN (vxlan4_gbp_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return vxlan_gbp_input (vm, node, from_frame, /* is_ip4 */ 1);
}
VLIB_NODE_FN (vxlan6_gbp_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return vxlan_gbp_input (vm, node, from_frame, /* is_ip4 */ 0);
}
static char *vxlan_gbp_error_strings[] = {
#define vxlan_gbp_error(n,s) s,
#include <vnet/vxlan-gbp/vxlan_gbp_error.def>
#undef vxlan_gbp_error
#undef _
};
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vxlan4_gbp_input_node) =
{
.name = "vxlan4-gbp-input",
.vector_size = sizeof (u32),
.n_errors = VXLAN_GBP_N_ERROR,
.error_strings = vxlan_gbp_error_strings,
.n_next_nodes = VXLAN_GBP_INPUT_N_NEXT,
.format_trace = format_vxlan_gbp_rx_trace,
.next_nodes = {
#define _(s,n) [VXLAN_GBP_INPUT_NEXT_##s] = n,
foreach_vxlan_gbp_input_next
#undef _
},
};
VLIB_REGISTER_NODE (vxlan6_gbp_input_node) =
{
.name = "vxlan6-gbp-input",
.vector_size = sizeof (u32),
.n_errors = VXLAN_GBP_N_ERROR,
.error_strings = vxlan_gbp_error_strings,
.n_next_nodes = VXLAN_GBP_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [VXLAN_GBP_INPUT_NEXT_##s] = n,
foreach_vxlan_gbp_input_next
#undef _
},
.format_trace = format_vxlan_gbp_rx_trace,
};
/* *INDENT-ON* */
typedef enum
{
IP_VXLAN_GBP_BYPASS_NEXT_DROP,
IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP,
IP_VXLAN_GBP_BYPASS_N_NEXT,
} ip_vxlan_gbp_bypass_next_t;
always_inline uword
ip_vxlan_gbp_bypass_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, u32 is_ip4)
{
vxlan_gbp_main_t *vxm = &vxlan_gbp_main;
u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
vlib_node_runtime_t *error_node =
vlib_node_get_runtime (vm, ip4_input_node.index);
ip4_address_t addr4; /* last IPv4 address matching a local VTEP address */
ip6_address_t addr6; /* last IPv6 address matching a local VTEP address */
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
if (node->flags & VLIB_NODE_FLAG_TRACE)
ip4_forward_next_trace (vm, node, frame, VLIB_TX);
if (is_ip4)
addr4.data_u32 = ~0;
else
ip6_address_set_zero (&addr6);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
vlib_buffer_t *b0, *b1;
ip4_header_t *ip40, *ip41;
ip6_header_t *ip60, *ip61;
udp_header_t *udp0, *udp1;
u32 bi0, ip_len0, udp_len0, flags0, next0;
u32 bi1, ip_len1, udp_len1, flags1, next1;
i32 len_diff0, len_diff1;
u8 error0, good_udp0, proto0;
u8 error1, good_udp1, proto1;
/* Prefetch next iteration. */
{
vlib_buffer_t *p2, *p3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
vlib_prefetch_buffer_header (p2, LOAD);
vlib_prefetch_buffer_header (p3, LOAD);
CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
}
bi0 = to_next[0] = from[0];
bi1 = to_next[1] = from[1];
from += 2;
n_left_from -= 2;
to_next += 2;
n_left_to_next -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
if (is_ip4)
{
ip40 = vlib_buffer_get_current (b0);
ip41 = vlib_buffer_get_current (b1);
}
else
{
ip60 = vlib_buffer_get_current (b0);
ip61 = vlib_buffer_get_current (b1);
}
/* Setup packet for next IP feature */
vnet_feature_next (&next0, b0);
vnet_feature_next (&next1, b1);
if (is_ip4)
{
/* Treat IP frag packets as "experimental" protocol for now
until support of IP frag reassembly is implemented */
proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
}
else
{
proto0 = ip60->protocol;
proto1 = ip61->protocol;
}
/* Process packet 0 */
if (proto0 != IP_PROTOCOL_UDP)
goto exit0; /* not UDP packet */
if (is_ip4)
udp0 = ip4_next_header (ip40);
else
udp0 = ip6_next_header (ip60);
if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan_gbp))
goto exit0; /* not VXLAN_GBP packet */
/* Validate DIP against VTEPs */
if (is_ip4)
{
if (addr4.as_u32 != ip40->dst_address.as_u32)
{
if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
goto exit0; /* no local VTEP for VXLAN_GBP packet */
addr4 = ip40->dst_address;
}
}
else
{
if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
{
if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
goto exit0; /* no local VTEP for VXLAN_GBP packet */
addr6 = ip60->dst_address;
}
}
flags0 = b0->flags;
good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_udp0 |= udp0->checksum == 0;
/* Verify UDP length */
if (is_ip4)
ip_len0 = clib_net_to_host_u16 (ip40->length);
else
ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
len_diff0 = ip_len0 - udp_len0;
/* Verify UDP checksum */
if (PREDICT_FALSE (!good_udp0))
{
if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
{
if (is_ip4)
flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
else
flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
good_udp0 =
(flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
}
}
if (is_ip4)
{
error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
}
else
{
error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
}
next0 = error0 ?
IP_VXLAN_GBP_BYPASS_NEXT_DROP :
IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP;
b0->error = error0 ? error_node->errors[error0] : 0;
/* vxlan-gbp-input node expect current at VXLAN_GBP header */
if (is_ip4)
vlib_buffer_advance (b0,
sizeof (ip4_header_t) +
sizeof (udp_header_t));
else
vlib_buffer_advance (b0,
sizeof (ip6_header_t) +
sizeof (udp_header_t));
exit0:
/* Process packet 1 */
if (proto1 != IP_PROTOCOL_UDP)
goto exit1; /* not UDP packet */
if (is_ip4)
udp1 = ip4_next_header (ip41);
else
udp1 = ip6_next_header (ip61);
if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan_gbp))
goto exit1; /* not VXLAN_GBP packet */
/* Validate DIP against VTEPs */
if (is_ip4)
{
if (addr4.as_u32 != ip41->dst_address.as_u32)
{
if (!hash_get (vxm->vtep4, ip41->dst_address.as_u32))
goto exit1; /* no local VTEP for VXLAN_GBP packet */
addr4 = ip41->dst_address;
}
}
else
{
if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
{
if (!hash_get_mem (vxm->vtep6, &ip61->dst_address))
goto exit1; /* no local VTEP for VXLAN_GBP packet */
addr6 = ip61->dst_address;
}
}
flags1 = b1->flags;
good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_udp1 |= udp1->checksum == 0;
/* Verify UDP length */
if (is_ip4)
ip_len1 = clib_net_to_host_u16 (ip41->length);
else
ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
udp_len1 = clib_net_to_host_u16 (udp1->length);
len_diff1 = ip_len1 - udp_len1;
/* Verify UDP checksum */
if (PREDICT_FALSE (!good_udp1))
{
if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
{
if (is_ip4)
flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
else
flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
good_udp1 =
(flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
}
}
if (is_ip4)
{
error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
}
else
{
error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
}
next1 = error1 ?
IP_VXLAN_GBP_BYPASS_NEXT_DROP :
IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP;
b1->error = error1 ? error_node->errors[error1] : 0;
/* vxlan_gbp-input node expect current at VXLAN_GBP header */
if (is_ip4)
vlib_buffer_advance (b1,
sizeof (ip4_header_t) +
sizeof (udp_header_t));
else
vlib_buffer_advance (b1,
sizeof (ip6_header_t) +
sizeof (udp_header_t));
exit1:
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *b0;
ip4_header_t *ip40;
ip6_header_t *ip60;
udp_header_t *udp0;
u32 bi0, ip_len0, udp_len0, flags0, next0;
i32 len_diff0;
u8 error0, good_udp0, proto0;
bi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
if (is_ip4)
ip40 = vlib_buffer_get_current (b0);
else
ip60 = vlib_buffer_get_current (b0);
/* Setup packet for next IP feature */
vnet_feature_next (&next0, b0);
if (is_ip4)
/* Treat IP4 frag packets as "experimental" protocol for now
until support of IP frag reassembly is implemented */
proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
else
proto0 = ip60->protocol;
if (proto0 != IP_PROTOCOL_UDP)
goto exit; /* not UDP packet */
if (is_ip4)
udp0 = ip4_next_header (ip40);
else
udp0 = ip6_next_header (ip60);
if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan_gbp))
goto exit; /* not VXLAN_GBP packet */
/* Validate DIP against VTEPs */
if (is_ip4)
{
if (addr4.as_u32 != ip40->dst_address.as_u32)
{
if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
goto exit; /* no local VTEP for VXLAN_GBP packet */
addr4 = ip40->dst_address;
}
}
else
{
if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
{
if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
goto exit; /* no local VTEP for VXLAN_GBP packet */
addr6 = ip60->dst_address;
}
}
flags0 = b0->flags;
good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
/* Don't verify UDP checksum for packets with explicit zero checksum. */
good_udp0 |= udp0->checksum == 0;
/* Verify UDP length */
if (is_ip4)
ip_len0 = clib_net_to_host_u16 (ip40->length);
else
ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
len_diff0 = ip_len0 - udp_len0;
/* Verify UDP checksum */
if (PREDICT_FALSE (!good_udp0))
{
if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
{
if (is_ip4)
flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
else
flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
good_udp0 =
(flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
}
}
if (is_ip4)
{
error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
}
else
{
error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
}
next0 = error0 ?
IP_VXLAN_GBP_BYPASS_NEXT_DROP :
IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP;
b0->error = error0 ? error_node->errors[error0] : 0;
/* vxlan_gbp-input node expect current at VXLAN_GBP header */
if (is_ip4)
vlib_buffer_advance (b0,
sizeof (ip4_header_t) +
sizeof (udp_header_t));
else
vlib_buffer_advance (b0,
sizeof (ip6_header_t) +
sizeof (udp_header_t));
exit:
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
VLIB_NODE_FN (ip4_vxlan_gbp_bypass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip_vxlan_gbp_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_vxlan_gbp_bypass_node) =
{
.name = "ip4-vxlan-gbp-bypass",
.vector_size = sizeof (u32),
.n_next_nodes = IP_VXLAN_GBP_BYPASS_N_NEXT,
.next_nodes = {
[IP_VXLAN_GBP_BYPASS_NEXT_DROP] = "error-drop",
[IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP] = "vxlan4-gbp-input",
},
.format_buffer = format_ip4_header,
.format_trace = format_ip4_forward_next_trace,
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
/* Dummy init function to get us linked in. */
clib_error_t *
ip4_vxlan_gbp_bypass_init (vlib_main_t * vm)
{
return 0;
}
VLIB_INIT_FUNCTION (ip4_vxlan_gbp_bypass_init);
#endif /* CLIB_MARCH_VARIANT */
VLIB_NODE_FN (ip6_vxlan_gbp_bypass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip_vxlan_gbp_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_vxlan_gbp_bypass_node) =
{
.name = "ip6-vxlan-gbp-bypass",
.vector_size = sizeof (u32),
.n_next_nodes = IP_VXLAN_GBP_BYPASS_N_NEXT,
.next_nodes = {
[IP_VXLAN_GBP_BYPASS_NEXT_DROP] = "error-drop",
[IP_VXLAN_GBP_BYPASS_NEXT_VXLAN_GBP] = "vxlan6-gbp-input",
},
.format_buffer = format_ip6_header,
.format_trace = format_ip6_forward_next_trace,
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
/* Dummy init function to get us linked in. */
clib_error_t *
ip6_vxlan_gbp_bypass_init (vlib_main_t * vm)
{
return 0;
}
VLIB_INIT_FUNCTION (ip6_vxlan_gbp_bypass_init);
#endif /* CLIB_MARCH_VARIANT */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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